﻿<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
    <title></title>
    <link rel="stylesheet" href="//js.arcgis.com/3.13/esri/css/esri.css">
    <style>
      html, body, #map {
        height: 90%; width: 100%; margin: 0; padding: 0; 
      }
      #controls {
        background: #fff;
        box-shadow: 0 6px 6px -6px #999;
        color: #444;
        font-family: sans-serif;
        height: auto;
        left: 1em;
        padding: 1em;
        position: absolute;
        top: 1em;
        width: auto;
        z-index: 40;
      }
      #controls div {
        padding: 0 0 1em 0;
      }
    </style>

    <script src="//js.arcgis.com/3.13/"></script>
    <script>
        var map;

        require([
          "esri/map", "esri/geometry/Circle", "esri/symbols/SimpleFillSymbol",
          "esri/graphic", "esri/layers/GraphicsLayer",
          "dojo/dom", "dojo/dom-attr", "dojo/domReady!"
        ], function ( 
          Map, Circle, SimpleFillSymbol,
          Graphic, GraphicsLayer,
          dom, domAttr
        ) {
            map = new Map("map", {
                basemap: "streets",
                center: [-120.741, 56.39],
                slider: false,
                zoom: 6
            });
            var symbol = new SimpleFillSymbol().setColor(null).outline.setColor("blue");
            var gl = new GraphicsLayer({ id: "circles" });
            var geodesic = dom.byId("geodesic");
            map.addLayer(gl);
            map.on("click", function (e) {
                var radius = map.extent.getWidth() / 10;
                var circle = new Circle({
                    center: e.mapPoint,
                    geodesic: domAttr.get(geodesic, "checked"),
                    radius: radius
                });
                var graphic = new Graphic(circle, symbol);
                gl.add(graphic);
            });
            
            dojo.connect(dojo.byId('delete'),'click',function(){
            	gl.clear();
            })
            
            
        });
    </script>
  </head>
  <body>
    <div id="map"></div>
    <div id="controls">
      <div>Click the map.</div>
      <input type="checkbox" id="geodesic">
      <label for="geodesic">Geodesic?</label>
    </div>
    <div id="delete">删除</div>
  </body>
</html> 